PROSYを保有する機関一覧（16社）
現在 16 社の機関がPROSYを保有しており、以下は保有時価総額の高い順です。
| 主要保有機関 | 申告総額 | 平均比率 |
|---|---|---|
| S&CO INC | $2243.4万 | 1.39% |
| Boston Common Asset Management, LLC | $263.5万 | 0.17% |
| RHUMBLINE ADVISERS | $161.8万 | 0.00% |
| DRW Securities, LLC | $70.2万 | 0.01% |
| YOUSIF CAPITAL MANAGEMENT, LLC | $58.4万 | 0.01% |
| GAMMA Investing LLC | $40.6万 | 0.02% |
| Calydon Capital | $15.3万 | 0.03% |
| Canopy Partners, LLC | $10.9万 | 0.04% |
| PNC FINANCIAL SERVICES GROUP, INC. | $10.5万 | 0.00% |
| Westside Investment Management, Inc. | $3.5万 | 0.01% |
| KELLEHER FINANCIAL ADVISORS | $1.4万 | 0.00% |
| Salomon & Ludwin, LLC | $1.0万 | 0.00% |
| Ascentis Wealth Management, LLC | $3616.0 | 0.00% |
| IMA Advisory Services, Inc. | $2016.0 | 0.00% |
| First Command Advisory Services, Inc. | $352.0 | 0.00% |
| HANTZ FINANCIAL SERVICES, INC. | $0.0 | 0.00% |